Support for logback-access 2.0.0

[sondemar]

closes #1014

[runeflobakk]

This is great work, and I hope this can be merged and released soon 🙏
Logstash Logback Encoder is currently not compatible with Spring Boot 3.3.x and Jetty 12.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.75%. Comparing base (1ac92af) to head (4af3eec).
Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1015      +/-   ##
============================================
- Coverage     71.78%   71.75%   -0.03%     
+ Complexity     1417     1416       -1     
============================================
  Files           177      177              
  Lines          5178     5177       -1     
  Branches        534      534              
============================================
- Hits           3717     3715       -2     
  Misses         1197     1197              
- Partials        264      265       +1     

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